Method of and apparatus for waxing paper



W. L. CARTER.

METHOD 0F AND APPARATUS FOR-WAXING PAPER.

APucATloN HLED A1AY'15,1920.

A Paflented Sept. 26, 1922.

www2@ t Patented Sept. 26, 1922..

UNiTn STATES WINTHROP L. CARTER, OIEl NASEUA, NEW HAMPSHIRE.

METHOD F AND APPARATUS FOR WAXING PAPER.

Application med may 15, 1920. seriai No. 381,706.

4the following description, in connection I with the accompanyingdrawings, is a specicatioii, like characters on the drawings repjresenting like parts.

This invention relates to methods of and apparatus for treating paperwith paraliine or other wax, one object beingto secure a smooth even`finish while performing thex coating operation at a relativelyhigh rateof speed.

'The invention will be best understood by reference to the followingdescription when taken in connection with the accompanying illustrationof one specific embodiment thereof, while its scope will bev more particularly pointed out in claims.

Figure 1 isa side elevation, in partial section, showing an apparatusembodying one form of the invention and capable of carrying out onelform of the method; and

F 2 is a sectional elevationtaken through one of the polishing rolls onthe line 2-2 in Fig. 1.

Referring to the drawings-and to the einbodiment of the inventiontherein selected for illustration, the machine therein shown comprises aframework 3, at one end of whichk there are provided adjustable bearings5 aii'd 7 for the shaft of a supply roll of paper 9, either one ofwhich` sets of bearings may be employed, as desired. .At the oppositeend of the machine there is provided the winding reel 11 driven by thedriving belt 13, the paper designated as P being wound upon the reel 114andunwound from the supply roll 9 at a relatively high rate of speedand being subjected to the intermediate steps of waxing and finishing.

On leaving th'e supply roll, the paper, before being subjected to theheated wax, preferably passes over a system of guiding and tensioningrolls which are herein shown as embodiediin the companion guide vrolls15 and 17 journalled on the frameworkof the machine` and the succeedingguide roll 19. Thence the paper passes into the wax pan 21 which issupplied with paraiiine in a the appended melted state, kept heated bymeans of the steam jacket -23 supplied through the inlet and outletpipes 25 and 27 respectively, the paper being caused to pass throughthemelted paraiine at a depth which is-determined by the. adjustable guideroll29. The latter is supported at opposite sidesv of the machine uponvertically adjustable guides 31, each vcapable of vertical adjustmentthrough the screws 33 and a system of bevel gears 35 controlled by thehand wheel 37, so lthat the depth -of immersion and the length of thepaper immersed may be adjustably controlled. y

As the'4 paper. passes through the melted paralline it becomes saturatedtherewith and then passes upward over the guide roll 39 and thencebetween thesqueeze rolls 41 and 43 which` act to press out and removethe surplus melted wax. These rollsv may be of any suitableconstruction, such as that shown in my prior Patent 1,140,873, andprovided with any suitable surface or jacket covering, the lower rollbeing preferably hollow and provided with suitable means for admittingsteam to the intei'ior thereof for heating it, as through the inlet pipe45. The upper roll is carriedin bearings 47 verticallyadjustable bymeans of the feed screw 49 and hand wheel 51, so that the -pressurebetween the rolls may be varied. 1

The paper, having had the surplus wax removed, next passes to thepolishing rolls 53 and 55 which are driven in the opposite direction tothe travel of the paper- (as indicated by the arrows in Fig. 1) by meansof the driving belt or chain 57 driven from the lower squeeze rollshaft. The polishing rolls 53 and 55 (see Fig. 2) are preferablyconstructed of metal, herein of brass, and present a smooth, polished,burnishing surface, preferably heated by suitable heat! ing means.Herein .the rjolls are hollow (see Fig. 2),`one end of the roll shaftpassing into a suitable stationary stuffing box bearing 59 and providedwith the steam pipe connection 61 which passes through the stufl'ing boxinto the interior of the hollow roll. Condensation is withdrawn througha suitable pipe connection with the drip opening 63 in the end of thestuiling box. I

The heated polishing rolls, pressing against the rapidly moving paperand being driven in the opposite direction to the travel thereof`rimpart a smooth, even. glossy iinish to the was. To vary the pressure ofthe polishing rolls on the paper, one or both ot the rolls may beadjustable` the roll 55 being herein shown as mounted in bearings 'whichmay be vertically adjustable by means ot the screw 65 and hand Wheel 67.The steam pipe connections til and 69 to the two rolls 53 and 55 areconnected to any suitable main ".71.

n order to preserve the finish imparted by the polishing` rolls, the Waxshould be set andhardencd as quickly as possible after leaving theburnishing rolls and under conditions which will create no tendency todisturb the distribution of the Wax or .impair the linish impartedthereto by the polishing rolls. s-Vhere the hardening is eiiected bypassing the paper through a cold water bath. if the paper is moved at arelatively `high rate of speed the motion set up in the water or theimpact of the Water or the removal of the surplus Water which lisnecessary before the paper car. be reeled up. or one or more of theseconditions, tends to disturb the polished coating of soft yvax and toproduce an uneven finish or one having a more or less mottledappearance. ln the illustrated form of my invention, the inished wax asit leaves the burnishing roll is set or hardened by cause ing the paperto travel over a smooth, hard, cooling surface which herein andpreferably is in the form of a metallic roll caused to travel in thesame direction with the paper and chilled or cooled by any suitablemeans. By this means the paper is transferred immediatelyv from theheated burnishing roll to the smooth cooling roll or rolls and the waxset or hardened without the introduction of any disturbing conditionswhich would tend to impair the finish which has been imparted tothe Waxwhile hot.

To thus set or harden the Wax, l have provided a series of cooling rolls73 so arranged that they provide an ample surface of contact for thepaper which travels around and with the rolls, as indicated in Fig. :5.the paper passing over the upper roll and thence down over .the lowerrolls,

and reel l1. The rolls T3 may be driven by any suitable means but hereinare driven by the belt or chain 57 which passes from the polishing roll55 to the uppermost roll of the series` and from the lowermost roll tothe lower squeeze roll shaft after passing over the idle pulley 75.

The cooling rolls 78 may be cooled also byany suitable means but hereinare hollow and of a general construction similar to that shown in Fig. 2for the burnishing rolls. To chill the rolls.r cooling Water or otherfluid is introduced through a fixed from the lowermost roll to theWinding .aaaeae stufling box at the end of each roll by means of thesupply pipe T7 and withdrawn through the outlet pipes T9. llihile liquidfrom any suitable source may be utilized, herein the same is provided bya small refrigerating plant, indicated diagrammatically at 81, driven bythe electric motor 83 and connected to the feed pipes lby the supplymain 85 and the return pipe 87.

'l` he cooling rolls may be constructed of any suitable material butpreferably of metal with a finished or polished surface and alsopreferably of brass or copperplated to minimize surface condensation.

By the use of the apparatus herein shovvn` the paper may be given a highrate of travel without impairing the finish thereof and after passingover the smooth surface of the cooling rolls, which are preferablydriven at the same rate of speed as the rate of travel ot the paoer. isdelivered to the winding reel ll in a dry, hardened and completelyfinished condition. The unsupported or unguided travel of the paper isrelatively short. permitting maintenance 0f a high speed of travel.vithout any vibratory movement of the paper; and, when the latter isfirst installed and lined up in the machine at the commencement of .irun, there is very small initial Waste as compared with the wastage ofpaper which( results from lining-up when a water bath is employed.

While I have herein shoivn and described for purposes of illustrationone specific form of the invention` it is to be understood that the sameis not limited to the specific details or relative form or arrangementof parts herein shown but that extensive devia` tions may be madeWithout departing from the spirit thereof.

Claims:

l. The method of waxing paper which consists in passing the same throughheated wax. squeezing the surplus wax therefrom...

polishing the surface while still hot, and then immediately chilling thewax to harden the same by contact with a chilled surface moving in thesame direction as thevpaper to avoid disturbing the polish.

2. vAl machine for making waxed paper having a receptacle for heatedWax. means for guiding the paper through the Wax.

means for removing the surplus wax, one or more heated polishing rollsover which the paper is passed together with means for driving the sameand one or more cooling rolls for chilling the paper without disturbingthe polished surface.

8. n a machine for making waxed paper the combination with means forapplying heated Wax to the paper, a burnishing roll for burnishing thesame while hot, means to drive the same, of one or more cooling rolls towhich the paper is immediately thereafter means for introducing acooling liquid .to ,the-

delivered and means for driving said rolls in lthe same direction as thetravel of the paper.

4. In a' machine .for making waxed paper the combination with paperguiding and feeding means of means for applying heated wax thereto, aheated burnishing roll in contact with which the paper is guided, meansfor driving said burnishing'roll in adirecltion opposite to the travelof the paper and a cooling member having a smooth cooling surface overwhich the 'paper is carried from the burnishing roll.

5. In a machine for 'making waxed paper the combination with paperguiding and feeding means of means for applying heated wax thereto, aheated burnishing roll in contact vwith which the paper is guided, meansfor driving said burnishing roll in a direction `opposite to the ltravelof the paper and a cooling member having a smooth cooling surface overwhich the paper is carried from the burnishing roll, said vcoolingmember comprising a hollow metallic roll with means for introducing acooling liquid to the interior thereof. A

6. In amachine for making waxed paper the combination with paper guidingand feeding means of means for applying heated wax thereto, a heatedburnishing roll in contact with which the paper is guided,vmeans fordriving said burnishing roll in-a -direction opposite to the travel ofthe paper and a cooling member having a smooth cooling surface overwhich the paper is carried from the burnishing roll, Asaid` coolingmember comprising. a hollow metallic roll with interior therof and meansfor driving said roll in the same direction as the travel of the paperand at substantially the same speed therewith.

7. In a machine for waxing paperpthe combination with a receptacle forheated wax, squeeze rolls, a plurality of heated burnishing rolls, aplurality of chilled rolls, and means for guiding the paper to -pass thesame first in contact with heated wax in said receptacle, next betweenthe squeeze rolls, next in contact on one side with one burnishing rolland then on the opposite side,`

in contact with another burnishing roll, next in contact` on one sidewith a coolingoll and then 4on the opposite side in contact with-another cooling roll, said -burnishing rolls being driven in adirection opposite to the travel of the paper and the cooling rollstravelinggin the same direction as 'the paper s and at substantially thesame speed.

8. In a machine for waxing paper, the combination with a receptacle forthe heated wax, squeeze rolls, a heated burnishing member, a coolingmember, -and means for guiding the paper to pass first in contact withthe heated wax iii-said receptacle, next between the squeeze' rolls,then in contact with said heated burnishing member, next in contact withsaid cooling member, burnishing member being moved in a direc tionopposite to the travel of the paper and said cooling directiontherewith.

In testimony whereof, I have signed my @fname to this specification.

WINTI-IBOP L. CARTER.

said heated eol '70 member traveling in the same

